// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_BASE_DATA_SOURCE_H_
#define MEDIA_BASE_DATA_SOURCE_H_

#include <stdint.h>

#include "base/callback.h"
#include "base/macros.h"
#include "base/time/time.h"
#include "media/base/media_export.h"

namespace media {

class MEDIA_EXPORT DataSource {
public:
    typedef base::Callback<void(int64_t, int64_t)> StatusCallback;
    typedef base::Callback<void(int)> ReadCB;

    enum { kReadError = -1,
        kAborted = -2 };

    DataSource();
    virtual ~DataSource();

    // Reads |size| bytes from |position| into |data|. And when the read is done
    // or failed, |read_cb| is called with the number of bytes read or
    // kReadError in case of error.
    virtual void Read(int64_t position,
        int size,
        uint8_t* data,
        const DataSource::ReadCB& read_cb)
        = 0;

    // Stops the DataSource. Once this is called all future Read() calls will
    // return an error.
    virtual void Stop() = 0;

    // Similar to Stop(), but only aborts current reads and not future reads.
    virtual void Abort() = 0;

    // Returns true and the file size, false if the file size could not be
    // retrieved.
    virtual bool GetSize(int64_t* size_out) = 0;

    // Returns true if we are performing streaming. In this case seeking is
    // not possible.
    virtual bool IsStreaming() = 0;

    // Notify the DataSource of the bitrate of the media.
    // Values of |bitrate| <= 0 are invalid and should be ignored.
    virtual void SetBitrate(int bitrate) = 0;

private:
    DISALLOW_COPY_AND_ASSIGN(DataSource);
};

} // namespace media

#endif // MEDIA_BASE_DATA_SOURCE_H_
